/Engine/Plugins/Runtime/RigVM/Source/RigVMEditor/Public/Widgets/SRigVMVariableMappingWidget.h
Type verified, and make sure it's not double booked
typedef TBaseDelegate_TwoParams< void, const [FName](API\Runtime\Core\UObject\FName) &, [TArray](API\Runtime\Core\Containers\TArray)< [FName](API\Runtime\Core\UObject\FName) > & > FOnRigVMGetAvailableMapping